Agaricus blazei Murrill ss. Heinemann or Agaricus brasiliensis ss. Wasser (Wasser et al., 2002) is one of the most promising and studied mushroom species due to its nutritional and medicinal value (Mizuno, 2002). As with Agaricus bisporus (white button and porto- bello), A. blazei can also be cultivated on previously degraded mate- rials obtained through a two-phase fermentation process, making materials selective for the mushroom cultivation (Rinker, 1986).